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SN74HC21QDRQ1
Public Made by Adomby adom
Texas Instruments Logic Gates, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+50@@ -0,0 +1,50 @@+# SN74HC21QDRQ1++**Texas Instruments** · Logic Gates · SOIC-14++SN74HC21QDRQ1 from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1A | input | Data input A of AND gate 1; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 2 | 1B | input | Data input B of AND gate 1; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 3 | NC | unconnected | Not connected; the datasheet labels this pin NC and gives no further function. |+| 4 | 1C | input | Data input C of AND gate 1; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 5 | 1D | input | Data input D of AND gate 1; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 6 | 1Y | output | Output of gate 1 (Y = A·B·C·D); can drive up to ten LSTTL loads with ±4 mA drive at 5 V. |+| 7 | GND | power_in | Ground reference pin for the device. |+| 8 | 2Y | output | Output of gate 2 (Y = A·B·C·D); can drive up to ten LSTTL loads with ±4 mA drive at 5 V. |+| 9 | 2A | input | Data input A of AND gate 2; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 10 | 2B | input | Data input B of AND gate 2; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 11 | NC | unconnected | Not connected; the datasheet labels this pin NC and gives no further function. |+| 12 | 2C | input | Data input C of AND gate 2; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 13 | 2D | input | Data input D of AND gate 2; unused inputs must be held at VCC or GND, and input current is 1 µA max. |+| 14 | VCC | power_in | Supply voltage, 2 V to 6 V recommended operating range (absolute maximum 7 V). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SOIC-14 |+| Category | Logic |+| Pins | 14 |++## CAD (KiCad official)++- Symbol: `SN74HC21QDRQ1`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOIC-14 (KiCad packages3D, STEP)+- 3D model files: `sn74hc21qdrq1-etched.step` / `sn74hc21qdrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hc21qdrq1.step` / `sn74hc21qdrq1.glb` are the bare package body.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74hc21-q1) (15 pp, sha256 `f6de9b707f217039`, retrieved 2026-10-08, tier: lcsc)+- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/sn74hc21qdrq1-datasheet.pdf)
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The ordering table o; The datasheet labels pins 3 and 11 as NC but does not define them further. They are marked unconnect"+ ],+ "pages_sent": 15,+ "cost_usd": 0.063,+ "at": "2026-10-08T00:07:33"+ },+ "datasheet": {+ "url": "https://www.ti.com/cn/lit/gpn/sn74hc21-q1",+ "pages": 15,+ "sha256": "f6de9b707f217039",+ "source_tier": "lcsc"+ },+ "cad": "KiCad official (CC-BY-SA 4.0)",+ "pins": {+ "total": 14,+ "described": 14,+ "cites_pages": true,+ "refuses_to_fabricate": true+ }+ },+ "viewers": {+ "symbol": "viewers/symbol.html",+ "footprint": "viewers/footprint.html"+ },+ "models_3d": [+ {+ "file": "sn74hc21qdrq1.step",+ "role": "plain",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 8.7,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ },+ {+ "file": "sn74hc21qdrq1-etched.step",+ "role": "eda",+ "up": "Z",+ "units": "mm",+ "origin": "footprint origin = pad-pattern centre",+ "seat": "z = 0",+ "extents_mm": [+ 6,+ 8.7,+ 1.75+ ],+ "zmin_mm": 0,+ "centre_offset_mm": 0,+ "footprint_binding": "identity",+ "sha256": "48332460f9ecdc7d93aa28703df819601374170a5744719c65a0bb93623d5a81",+ "checked": "2026-10-08",+ "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"+ }+ ]+ },+ "visibility": "public",+ "org": "adom",+ "author": {+ "name": "Ray",+ "email": "[email protected]"+ }+}